Cold-induced sweetening (CIS) in potato is detrimental to the quality of processed products. Conversion of starch to reducing sugars (RS) by amylases is considered one of the main pathways in CIS but is not well studied. The amylase genes StAmy23, StBAM1, and StBAM9 were studied for their functions in potato CIS. StAmy23 is localized in the cytoplasm, whereas StBAM1 and StBAM9 are targeted to t...

Starch is an interesting, natural, abundant and renewable raw material. For many applications, its properties can be improved by chemical modification, and acylation has been commonly used. Traditionally this makes use of powerful acylating agents (anhydrides and acid chlorides) and/or harsh conditions. Enzymatic acylation would be attractive because of the use of mild conditions, specific reac...

The susceptibility of starch-based biomaterials to enzymatic degradation by amylolytic enzymes (glucoamylase and alpha-amylase) was investigated by means of incubating the materials with a buffer solution, containing enzymes at different concentrations and combinations, at 37 degrees C for 6 weeks. Two polymeric blends of corn starch with poly(ethylene-vinyl alcohol) copolymer and poly(epsilon-...

Our knowledge of starch has been gained largely from a study of the properties and composition of this substance as found in the storage organs of plants, such as seeds, tubers, and roots. Although its presence in leaves as a product of photosynthesis, that is autochthonic starch, has been known for a long time, and its formation, dissolution, and some of its properties in situ have been studie...

Backgrounds & objectives: Contamination of the environment by heavy metals, pollute water and agricultural products. The aggregation of these metals will cause various diseases for human. Therefore, it is important to study how to make them safe. The purpose of this study is to evaluate the efficiency of starch-iron oxide nanocomposite in removing two heavy metals, nickel and cadmium, from wast...

The action of cw-amylase on undegraded starch and on dextrins of high molecular weight is roughly 100 times as rapid as its action on the smaller dextrins formed subsequently. The mechanism of this action has been studied in two ways. By kinetic methods, the course and rate of hydrolysis at varying substrate concentrations are determined. Thus Myrback and Johansson (1) calculated the affinities...

Cereal Chem. 76(1):96-99 A corn wet-milling process in which alkali was used was studied as an alternative to the conventional corn wet-milling procedure. In the alkali wet-milling process, corn was soaked in 2% NaOH at 85°C for 5 min and then debranned mechanically to obtain pericarp as a coproduct. Debranned corn was cracked in a roller mill, and the cracked corn was steeped with agitation fo...

Amaranth has attracted a great deal of interest in recent decades due to its valuable nutritional, functional, and agricultural characteristics. Amaranth seeds can be cooked, popped, roasted, flaked, or extruded for consumption. This study compared the in vitro starch digestibility of processed amaranth seeds to that of white bread. Raw seeds yielded rapidly digestible starch content (RDS) of 3...

Four sorghum hybrids (Fontanelle-625 [F-625]), Fontanelle-1000 [F-1,000], ATx631xRTx2907 [NE#20] and 5,040C) were characterized and evaluated for kernel characteristics, proximate analysis, flour characterization (particle size distributions, starch damage, amylose content and starch pasting properties) and end product in gluten-free tortilla. A commercial sorghum flour (TVM) was used as a cont...